Bachelor's degree certificate (bachelor? Degree? Certificate): Generally, it is a four-year undergraduate certificate, such as Bachelor of Arts and Bachelor of Science.
Master's degree certificate (master? Degree? Certificate): generally, it is a certificate of postgraduate courses, and you need to continue your studies after obtaining a bachelor's degree, such as a master's degree and a master's degree in art.
Doctoral degree certificate (doctor? Degree? Certificate): Generally, it is a certificate of a higher-level postgraduate course, and you need to continue your studies after obtaining a master's degree, such as a doctor, a doctor of medicine, etc.